Jeep grand cherokee 2018, Owner'S Manual, Page: 193 / 620

NOTE: There is no tire pressure monitoring sensor in the
spare tire. The TPMS will not be able to monitor the tire
pressure. If you install the spare tire in place of a road tire
that has a pressure below the low-pressure warning limit,
upon the next ignition switch cycle, the Tire Pressure
Monitoring Telltale Light will remain on, a chime will
sound, and the instrument cluster display will still display
a pressure value in the different color graphic display and
an “Inflate to XX” message will be displayed. After driving
the vehicle for up to 20 minutes above 15 mph (24 km/h),
the Tire Pressure Monitoring Telltale Light will flash on
and off for 75 seconds and then remain on solid. In
addition, the instrument cluster display will display a
“SERVICE TPM SYSTEM
⬙
message for five seconds and
then display dashes (- -) in place of the pressure value. For
each subsequent ignition switch cycle, a chime will sound,
the Tire Pressure Monitoring Telltale Light will flash on
and off for 75 seconds and then remain on solid, and the
instrument cluster display will display a ⬙ SERVICE TPM
SYSTEM ⬙ message for five seconds and then display
dashes (- -) in place of the pressure value. Once you repair
or replace the original road tire, and reinstall it on the
vehicle in place of the spare tire, the TPMS will update
automatically.
In addition, the Tire Pressure Monitoring Telltale Light will
turn off and the graphic in the instrument cluster display
will display a new pressure value instead of dashes (- -), as
long as no tire pressure is below the low-pressure warning
limit in any of the four active road tires. The vehicle may
need to be driven for up to 20 minutes above 15 mph
(24 km/h) in order for the TPMS to receive this informa-
tion.
TPMS Deactivation — If Equipped
The TPMS can be deactivated if replacing all four wheel
and tire assemblies (road tires) with wheel and tire assem-
blies that do not have TPMS Sensors, such as when
installing winter wheel and tire assemblies on your vehicle.
To deactivate the TPMS, first, replace all four wheel and
tire assemblies (road tires) with tires not equipped with
Tire Pressure Monitoring (TPM) Sensors. Then, drive the
vehicle for 20 minutes above 15 mph (24 km/h). The TPMS
will chime, the ⬙ TPM Telltale Light ⬙ will flash on and off for
75 seconds and then remain on. The instrument cluster will
display the “SERVICE TPM SYSTEM” message and then
display dashes (--) in place of the pressure values.
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SAFETY 191